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Nah, no crash, probably was a bit eager to get the rear wheel out so maybe banged it a bit hard but nothing that felt like it should have been an issue.
With any luck the senior mechanic will fix it all or declare it's buggered. Tonight I can connect the rear mech to my other bike and see if it shifts that one which I guess will tell me whether it's the mech or the shifter or something else.
atz
Does the RD actually move? If the red light is on the Junction Box A it could be in fine-adjustment mode. Assuming you've already held that down for 10s or whatever then it's unlikely but possible. If the derailler is making a noise when you push the shifter button, it's not the shifter button failing it's likely trying to move but can't so either something (like my B-screw setup) is preventing it from moving or the unit is fuxxored in some other way internally, but that seems unlikely given not crashy crashy (I assume, not been following conversation).